Apply casts to cases where xdrproc_t is expected but is not
strictly passed, for example because the second argument is
a different kind of pointer.

Fix WARNS=4 issues (-Wshadow -Wcast-qual -Wsign-compare)

Add (unsigned char) cast to ctype functions

Modify the licences of code written by Theo De Raadt from a 4-clause
to a 2-clause licence (retaining UCB clauses (1) and (2)), per PR
22409 from Joel Baker, approved by Theo de Raadt, and ratified b

Modify the licences of code written by Theo De Raadt from a 4-clause
to a 2-clause licence (retaining UCB clauses (1) and (2)), per PR
22409 from Joel Baker, approved by Theo de Raadt, and ratified by
myself - the only discrepancy being the handling of the original
clause 3 in src/usr.sbin/yppoll/yppoll.c.

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ANSIfy, remove __P().

KNF nit.

- hack ypdb_open() to try the standard hash (for sendmail's aliases.db)
if the initial open fails with EFTYPE. if a different database
format is found to be more efficient, just add the code to o

- hack ypdb_open() to try the standard hash (for sendmail's aliases.db)
if the initial open fails with EFTYPE. if a different database
format is found to be more efficient, just add the code to open it
prior to that of the other formats; this maintains backward
compatibility with older databases whilst providing new functionality...
- add rcsid's

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Fix compiler warnings (and an awful lot of annoying little bugs).

A ypserv implementation, originally written by Mats O Jansson, with
some changes by me, including misc. cleanup, minor bug fixes, and
brand-new access control list code.